Billing problem again!

I have been having billing issues since I did my upgrade with Vodacom last year in August. Firstly I have been incorrectly billed on numerous occasions, and had to call Vodacom daily, email and post complaints on Hello Peter just to sort out my account. Eventually it got sorted out. I have a Smart S+ package with them that I have with my new phone. This includes "Any network anytime Voice" bundle + Data bundle + SMS bundles. I asked the call centre agent if I could change my package to only data or minutes in order for me to buy data. The agent mentions that I would need to pay R500 to change my package. I decided did not change it, I left it out. My January bill comes and I notice that it is high again. My bill for calls was incredibly high. I do not make this many calls and usually never finish my Voice bundle. I called Vodacom to assist. The agent mentions "I called numbers outside Vodacom to Vodacom, and this is why I am being charged extra. This is impossible as I have "Any network, any anytime" Voice bundles. She then uses another excuse after she could not understand why I was charged, stating that my bundles were used up? How did she manage to see this. On my itemised billing it states the numbers I've called, and does not mention if my Voice bundle was used. I decided to forget about it and just pay it, because I cannot go through another battle. Today I noticed on my Vodacom App that I am being charged for Voice again!!! and I still have Voice bundles. I am VERY TIRED of dealing with Vodacom about this. I have been a loyal customer for years and now these problems.